Hey! Ok this is definitely a common problem for players in matches that they find they can’t play the same as in practice drills. The most important thing for you t to practice to help this is irregular drills where you don’t know where the ball is coming so for example the blocker can play 1 or 2 to your backhand then 1 or 2 to your forehand. Or you serve and the opponent can push long to the backhand or forehand.
Those are just 2 examples but the important thing is that you practice making those quick deciand getting into position to play the shot. So try to do lots of irregular drillsand lots with serve and return as well to make it as random and as realistic to match play as possible.
Another great one is short touch play with your opponent and when the push cones long trying to play the forehand attack. Let is know how you get on and if you have any other questions 🙂